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I had problem using your lib, and it seems I found a solution.
In traceur: https://github.com/google/traceur-compiler/blob/master/src/Compiler.js#L132 you can pass the filename argument to compile method.
I also remove
this._compiler.options_.filename = filename;
which seems to do nothing (also based on https://github.com/google/traceur-compiler/blob/master/src/Compiler.js)